score:3
The application only asks for your initial arrival date, not dates of every trip. Transit visas like most other US visas have a period of validity and a specified number of entries.
The potential of getting a multiple entry C-1 or a limited number of entries (1, 2, etc) depends on your citizenship. There is a webpage that you can enter the country of citizenship and see what the limits are on entries, validity, etc. But these are maximums not guarantees, as the consular staff can decide to limit your visa to less time or less visits.
https://travel.state.gov/content/visas/en/fees/reciprocity-by-country.html